VOLVO
UEM-0009 - Reading lamp. Signal too low
System
Upper Electronic Module (UEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
The upper electronic module (UEM) registers too low a signal from the rear left reading lamp. The fault is caused either by the switch for the lamp being jammed in the pressed position, or by the signal wire being short-circuited to ground. The interior lighting then does not work.
Possible causes
- The rear left reading lamp's switch is jammed down
- The signal wire to the rear left reading lamp is short-circuited to ground
What you can do
- 1Check whether the button for the rear left reading lamp is stuck in the pressed position.
- 2Read off the code, clear it and check whether it returns.
- 3Use a multimeter to check that the wire from the upper electronic module to the rear left reading lamp has no contact with ground.
- 4Look for pinched or chafed spots on the wire, especially at the lamp connector.
- 5If the fault remains, have a workshop check the wire and replace it if a fault is found.
Symptoms you may notice1
- The interior lighting does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.